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by changing from liquid to solid
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Is mixing sugar and water a physical change or a chemical?
Physical change.
When you heat up water and it changes to steam is it a physical or chemical change?
physical change because you are not doing anything to the object to change its ingredients or the way it is constructed and all you are really doing is adding heat.
Is making salt water to gargle for a sore throat a chemical or physical change?
Yes dissolving salt in water is a physical change. The chemical structure was not changed, no chemical reaction took place, no precipitate formed and so on.The best way to tell the difference between a chemical and physical change is the ability to change the substances back to the way they were.Salt can be removed from water through evaporation of the water leaving both substances chemically the same before the salt was added.However there is some debate upon this. Just go with whatever your teacher says.
Does physical change occur when epsom salt is dissolved?
Yes. The way I think about it is if you can change it back (in this case, you could filter the epsom salt out, or evaporate the water, drying it) then it is a physical change.
Is molded clay physical or chemical change?
physical, because it can be easily reversed
When iron rusts is that a chemical or physical change?
It is a chemical change, the iron is being oxidized and forming rust. A good way to think about it is if you can undo it then it is a physical change. For example if you put salt in water, that is a physical change because you can boil off the water and get the salt back. Source: AP Chemistry
Is splitting water through electrolysis into O2 and H2 gasses a physical or chemical change?
In a way it is both physical and chemical, because a chemical change is changing how the molecule is "built," while a physical change is the transformation from one form to the other. I would consider splitting water through electrolysis as a chemical change at first because physical change is keeping the build of a molecule the same while it's form changes. You could also say that the splitting itself occurs first, meaning chemical change first occurs. Physical change would the occur later because the points of physical forms change based on the atom or molecule. The time difference in which occurs first would be very hard to measure, down to nanoseconds, but according to common scientific sense chemical change would occur first. The true answer to this question would be that it is chemical change, because you wanted to know what the splitting part was. Hope this helps!
Is water boiling in a pan a physical or chemical change?
It depends on what is boiling. If you are boiling WATER, then it is NOT a chemical change, it is a physical change (change of state from liquid to gas). If you are cooking food on the stove, a chemical change is occuring. That is, the chemical bonds within the food molecules are actually changing. One way you can tell that it is a chemical change is that you can't "uncook" food, but you can condense steam back into water.
Which of the following is true about a physical change in matter?
It is something that can be seen, touched, tasted, smelled, or observed in some way.
What is the term for a process that does not change the identity of a substance?
Many physical changes will not alter the identity. However, some physical changes, such as heating or cooling will result in phase changes and so the identity will be different. While ice and water are chemically the same, they are not identical forms of the substance.
When a new substance is produced is it a chemical or physical change?
That's a chemical change because the structure of the atoms are changing. Chemical features can only be viewed through chemical change, by the way.
When a new substance is produced is it a physical or a chemical change?
That's a chemical change because the structure of the atoms are changing. Chemical features can only be viewed through chemical change, by the way.
